Safety vent valve



Patented `luly 26, 1927.v

UNITED STATES PATENT OFFICE.

mms r. HEIL AND ARTHUR Boncimnnr, or MILWAUKEE, wisoorraru".`

Y Y SAFETY vlami vnnvE.-

application inea February 9, 192s.' serial iro. 618,165.

This invention relates to improvements in safety ventvalves, morearticularly adapted for use on vtruck tanks or dispensing gasoline, oilsor other liquids. y

Tanks, and more particularly truck tanks for dispensing gasoline, oiland other like liquids, require an upper air vent 0 ning to permit theentrance of air in drawing the liquid from the tank, escape of gasgenerated from the liquid in the tank. It is also desirable to providemeans for automatically closing the vent in case the truck isaccidentaly tipped over,'to prevent the loss of the contents of thetank, and it is furthermore desirable to provide a vent valve with meansfor permitting the rapid escape of .gas generated inv the tank in theevent the contents of the tank is on re.

v lt le one of the objects of the present invention t0 provide asafetlyV vent valve possessing all of the before-mentioned` desirablefeatures, which is of very simple construction.

A-further object of the invention is to provide a safety vent valvewhich only requires one opening in the tank for attachment, and whilenormally closed will automatically open to let in air in drawing liquidfrom the tank and will automatically open to permit the escape of gaswhen the pressure exceeds a predetermined amount. l

A further object of the invention is to provide a safety vent valve inwhich` an inlet valve, an outlet valve, a valve for preventing the lossof liquid inthe event' the tank tips over, and a fuse valve are allineluded in the same'structure.

With the above and other the invention -consists of the improved safetyvent valveeand its parts and com hiiationsas set forth in the claims,and all equivalents thereof.

in the accompanying drawing in which same parts in all of the views:

Fig. 1 is atop view of the improved safety 3 is a. similiar view withthe e in apen position; and il a is horizontal sectional view thereof,taaen on line e a of Fig. 2.

and also to permit the therethrough. The supplemental objects in View, l

' the same reference characters indicate the' Referring to the drawing,the numeral 5 indicates a tubular main valve casing which is open' andalso threaded at both ends. T he lower threaded end portion 6 is of lessdiameter than the upper portion and "is w adapted to thread into theupper portion of a gasoline or other tank not shown). A supplementalvalve casing is threaded on the upper or larger end portion-8 of thecasing 5 and is formed with a main valve seat and opening 9 which isadapted to be' closed by anemergency ball valve '10 when the casing istipped over to prevent the escape of gasoline or other liquid from thetankf The said valve is positioned in the casing 5A and normally restsuponl the shoulder 11 of the vertical ribs 12 formed o`n the innerv-Wall of the casing -5.' Said i shoulders and ribs Ahold the valvespaced from the inner wall and the lower reduced portion of the casingso that the pore 5 thereof is free for the passage of air or gas l casin7 projects laterallyv from the casing 5. an is provided', with an airAinlet opening 13 closed by a stein valve14 opening inwardly in thecasing to admit air to the tank when liquid is drawn from the tank. Saidstem valve is formed of aluminum or other light Weight material in orderto open easily and the stein of the valve is guided in a guide member 15projecting outwardly from the supplemental casing beneath the valveopening 13.

The supplemental casing 7 immediately -above the valve 14 and inaxial'alinement therewith, is open and is provided with a tubular valveseat plug 16 threaded therein y and having a valve seat 17 formed in itslower portion immediately above the valve 14. A ball valve 18 mounted inthe tubular portion of. the plug andresting upon the seat 17 is adaptedto open by the pressure of gas generated in the tank. Upeniugs 19yformed in the side walls of the plugv 16 above the'valve seat ermit theescape of the as therethrough w ich passes through the valve seat 17. Adisk 20 closing the u per end "it the bore of the plug maintains tevalve :n the lug. l Tige upper wall of the sup l ing in axial alinementwith casing 5 is formed with an en cy ope@V ing 21 which is closed by afusible plug so. that in case of re the plug 22 would fuse and permitthe rapid discharge of gas vvhich may be generated at a greater ratethan the ca acity of the openings 17 and y19 topermit the escapethereof.

In operation, the air inlet valve 14 will open in drawing liquid fromthe tank to permit the entrance of air and the tree ovv of the liquid.Now incaseot the generation gas in the tank, the pressurethereot willdischarge valve'lB and permit the of said gas through the seat openingot said valve. ln the event` ot hre and the raid generation oit gas, theheat ot the hre vvi fuse the plug Q2 and provide atree enit tor the rapidischarge ot the gas. in the event that the tank truck is tipped over,the emergency valve l0 vvill close the main opening ot the valve seat 9and prevent vthe esca e ot the liquid Within the tanlr. "When notravving liquid trom the tanh, all ot the openings are closed, thuspreventing loss hy evaporation. v

l-lrom .the foregoing description it vvill be seen that the satety ventvalve is vvell adaptraise the discharge ed to expedite the discharge oiliquid from a tanlr and prevent the loss by evaporation and at the sametime permit the escape ot vvhich might cause troulole.

What vve claim as our invention is:

l. A sa't'ety vent valve, comprising a main valve casing open at its'upper and lovver endaa supplemental valve casing mounted on the-upperend portion oi said valve casing and having a valve outlet opening abovethe main casing and an inlet valve opening oaet therefrom and an outletopening above the odset opening, a valve positioned` in the main casingtor closing the valve opening adjacent thereto but being normally inopen position, a comparatively light vveight valve closing the inletopening, a valve plug mounted in the supplemental casing opening aloovethe inlet opening and having an outlet opening lormed therein and avalve closing said outlet opening.

E.. A safety vent valve, comprising ar main valve casing open at Aitsupper and lovver ends a supplemental valve casing mounted on the u perend portion ot said valve casing and aving a valve outlet opening abovethe main casing and an inlet valve opening odset therefrom and anoutlet'opeg above the odset opening, said supplemental 'casing alsohavin an emergency opening adja- I .emergency opening, -the supplementalcasing outlet opening inerme 55 a tusible plug closing said emergencythe inlet opening, aivalve plug mounted in the supplemental casingopening above the inlet opening and having an outlet opening formedtherein, and a valve closing said out-` let opening.

3. A safety vent valve, comprising a main valve casing open at its upperand lower ends, a supplemental valve casing having a threaded engagementwith the upper end oi the main casing and having a valve outlet openingabove the main casing and inlet opening odset therefrom andan outletopening ahove the odset opening, a valve plug mounted in thesupplemental casing outlet opening above the odset opening and having'an outlet opening termed therein, a balll valve closing said outletopening, a hall valve positioned in the main casing for closlng thevalve opeg adjacent thereto but being normally in open position, and acomparatively light Weight stem valve closing the inlet opening.

t A safety vent valve, comp-rising. a main valve casing open at itsupperand lovver ends, a supplemental valve casing having a threadedengagement with the upper end ot the main easing and having a valveoutlet opening above the main casing and an inlet opening odsettherefrom and an outletopening above the odset opening, said supplemental casing also having an emergency opening adjacent the outletA openingtrom the main casing, a fusible plug closing said a valve plug mountedin above the odset opening. and having an outlet opening formed therein,a' ball valve closing said outlet opening, a hall valve'pos'itioned inthe mainl casinilr for closing the valve opening adjacent thereto butlbeing normally in open position, and a comparatively light Weight stemvalve closing the inlet opening.

ln testimony whereof, We ax our signatures.

dlllillllS l?. lillltllli. y ARTHUR BRCHARDT lill lllll

